Chemistry Quiz 9/29/11
Qualitative Measurement
A measurement that gives descriptive, nonnumeric results
Accepted Value
A quantity used by general agreement of the scientific community
Percent Error
Absolute Value of the error divided by the accepted value, multiplied by 100%
Weight
Force that measures the pull of gravity on a given mass
Precision
How close a series of measurement is to one another
Accuracy
The closeness of a measurement to the true value of what is being measured
Kilogram
The mass of 1 L of water at 4°C; it is the base unit of mass in SI
Experimental Value
The quantitative measured during an experiment
Specific Gravity
The ratio of the density of a substance to that of a standard substance
Density
The ratio of the mass of an object to its volume
Celsius Scale
The temperature scale on which the freezing point of water is 0°C and the boiling point is 100°C
Liter (L)
The volume of a cube measuring 10 cm on each edge (1000cm³); it is the common unprefixed unit of volume in the metric system
Absolute Zero
The zero point on the Kelvin temperature scale equivalent to -273.15°C; all molecular motion theoretically stops at this temperature
Hydrometer
a device used to measure the specific gravity of a liquid
Temperature
a measure of the average kinetic energy of particles in matter; determines the direction of heat transfer
Quantitative Measurement
a measurement that gives definite, usually numeric results
Gram (g)
a metric mass unit equal to the mass of 1cm³ of water at 4°C
Significant Figure
all the digits that can be known precisely in a measurement, plus a last estimated digit
Scientific Notation
expression of numbers in the form n X 10n where n is equal to or greater than 1 and less than 10 and n is an integer
Meter (M)
the base unit of length in SI
Error
the difference between the accepted value & the experimental value
International System of Units (SI)
the revised version of the metric system, adopted by international agreement in 1960
Volume
the space occupied by a sample of matter
Kelvin Scale
the temperature scale in which the freezing point of water is 273K & the boiling point is 373K; 0K is absolute Zero
